基于硝酸盐的滴灌春小麦氮素追肥模型建立研究

Research of Drip Spring Wheat Nitrogen Fertilizer Model Based on Nitrate

【目的】采用作物营养诊断技术,建立基于植株硝酸盐的滴灌春小麦氮素诊断时期和追肥模型。【方法】在滴灌春小麦关键生育时期测定植株硝酸盐含量,通过硝酸盐浓度与施氮量及产量的关系,确定关键生育时期的氮素诊断追肥模型。【结果】不同生育时期的滴灌春小麦植株茎基部硝酸盐含量与产量之间具有极显著的相关性,计算出拔节期和孕穗期硝酸盐的临界值分别为2 782.5和2 553.06 mg/kg,构建了滴灌春小麦拔节期和孕穗期各阶段的追肥施肥模型。【结论】采用拔节期和孕穗期滴灌春小麦植株硝酸盐作为诊断指标,建立相应的追肥模型,确定了滴灌春小麦拔节期和孕穗期各阶段不同硝酸盐测试值所对应的氮肥追肥用量。

[ Objective ] To adopt crop nutrition diagnosis technology and establish fertilizer nitrogen diag- nosis period model of drip irrigation wheat based on the plant nitrate. [ Method ] Determine plant nitrate con- tent of key growth period of drip irrigation wheat through the relationship between nitrate concentration and N application rate and the yield and establish the fertilizer nitrogen diagnosis model of the key remaining period. [ Result] There was a very significant correlation between nitrate content of drip irrigation wheat plant stem base and the yield at different development stages, and the nitrate critical value of jointing stage and booting stage were 2 782.5 and 2 553.06 mg/kg, which established spring wheat jointing stage and booting stage fer- tilizer fertilization model of drip irrigation wheat. [ Conclusion] The plant nitrate of irrigation wheat the of joint- ing stage and booting stage as a diagnostic index was used to establish the corresponding application model and calculate the different nitrate test values corresponding to the amount of nitrogen fertilizer at the drip spring wheat jointing stage and booting stage.